Safety Technology 90dB Magnetic Door and Window Alarm 2 Pack – Adhesive Mount, On/Off Switch, Battery Included, 2.5″ x 1.75″ x 0.75″
$13.00
Buy with Confidence
Covered by a 30-Day Money Back Guarantee. If it's not right for you, returns are easy and hassle-free.
Secure checkout • 100% Satisfaction Guaranteed • 30 Day Money Back Guarantee • Easy Returns • Fast Customer Support
Magnetic door and window alarms work by detecting separation — when the two sensor halves move apart, the circuit breaks and the siren fires. These units mount with adhesive backing, require no wiring, and include batteries. The built-in on/off switch lets you open a protected window yourself without triggering the alarm. Two units included.
- 90dB siren triggers when the magnetic contact separates — door opens, window lifts, alarm sounds
- On/off switch lets you bypass the alarm when opening protected windows yourself
- Adhesive backing installs in under two minutes — one side to the frame, one to the door or window
- Works on doors, windows, sliding glass doors, and cabinet doors
- Batteries included; 1-year warranty from Safety Technology
Simple Magnetic Detection That Works on Any Door or Window
Magnetic contact alarms are one of the most reliable and straightforward window and door security tools available. Two small sensor pieces mount on opposite surfaces — one on the frame, one on the door or window itself. As long as they stay within range of each other, the circuit stays closed and the alarm stays silent. The moment they separate — because a door opens, a window lifts, or someone forces entry — the siren activates. No camera, no hub, no subscription required.
The 90dB output is clearly audible from adjacent rooms and outside the building, enough to alert occupants and deter casual intruders.
Who This Magnetic Door/Window Alarm Is For
Homeowners who want basic perimeter coverage without installing a full security system. Renters who need a no-damage, no-drill option that moves with them. Parents who want to know when a basement door, back gate, or bedroom window opens. Anyone adding a secondary layer of protection to entry points that a full system doesn’t cover.
The two-pack handles the most common entry-point pairing — a front door and a back door, or a door and a ground-floor window — at a cost that makes adding coverage straightforward rather than a financial decision.
Is This the Right Choice for You?
Choose the Magnetic Door/Window Alarm 2 Pack if you want:
- Reliable open/close detection on any door, window, or sliding panel
- A no-drill, adhesive-mount installation that takes two minutes
- A manual bypass switch so you can open protected windows without triggering the alarm
Consider something else if you need:
- Detection of glass impact before a window is fully opened — a vibration-based glass break alarm handles that
- Motion detection inside a room rather than at the entry point itself
How Magnetic Contact Alarms Work
Each unit consists of two pieces: the alarm body and a smaller magnet. Mount the alarm body on the door or window frame and the magnet on the door or window itself, positioned so both pieces sit within a few millimeters of each other when closed. The magnetic field keeps an internal reed switch closed. When the door or window opens and the pieces separate, the switch opens, the circuit breaks, and the 90dB siren activates.
The on/off switch on the alarm body lets you disarm the unit before opening the protected entry point — useful for windows you open regularly for ventilation. Flip it back to on when you close up, and coverage resumes immediately.
Installation takes two minutes. Peel the adhesive backing, position both pieces, confirm they align when closed, and switch the alarm on. Batteries are included and pre-installed.
Quick Comparison: How Does the Magnetic Door/Window Alarm Stack Up?
| Feature | Magnetic Door/Window Alarm | Glass Break Alarm | Door Stop Alarm | Motion Sensor |
|---|---|---|---|---|
| Detects door/window opening | Yes ✓ | No — impact only | Yes ✓ | After entry only |
| No-drill adhesive install | Yes ✓ | Yes ✓ | No installation needed ✓ | Varies |
| Manual bypass switch | Yes ✓ | No | No | Varies |
| Works on sliding glass doors | Yes ✓ | Yes ✓ | No | Varies |
| Portable for travel | Possible but adhesive is semi-permanent | Possible | Yes ✓ | Varies |
| Best For | Home doors, windows, sliding panels | Windows, glass storefronts | Hotel rooms, travel security | Interior room coverage |
Practical Details
Each unit measures 2.5″ x 1.75″ x 0.75″ and weighs 0.2 lbs. Three 1.5V LR44/AG13 button cell batteries included per unit. Mounts with peel-off adhesive — no tools or drilling. On/off switch built into the alarm body. Two units per pack, in white. 1-year warranty from Safety Technology.
Two entry points covered, batteries included, no tools needed — reliable magnetic detection for doors and windows in a two-minute install.
Frequently Asked Questions
Can I use these on a sliding glass door?
Yes. Mount the alarm body on the door frame and the magnet on the sliding panel, aligned so they sit close together when the door is fully closed. When the panel slides open, the magnetic contact separates and the siren activates. This works for most standard sliding door configurations. Make sure both surfaces are clean and dry before applying the adhesive for best hold.
What’s the maximum gap between the two sensor pieces before the alarm triggers?
Magnetic contact alarms typically trigger when the two pieces separate beyond roughly 1–1.5 centimeters, though this can vary slightly by unit. For reliable performance, mount both pieces so they’re within a few millimeters of each other when the door or window is fully closed. Misalignment or a larger-than-intended gap can cause false triggers or missed detections.
Will the adhesive damage my window frame or door paint?
The adhesive backing is designed for standard indoor surfaces. Removal can leave minor residue on some finishes, particularly on painted wood or older frames. If adhesive residue is a concern, isopropyl alcohol typically removes it without damaging most surface finishes. On surfaces where adhesive isn’t practical, small screws can be used as an alternative mounting method for most units of this type.
How do I stop the alarm from going off when I open the window myself?
Flip the on/off switch on the alarm body to the off position before opening the protected door or window. When you close it again, switch it back to on. Coverage resumes immediately — there’s no delay or reset procedure required. This is the intended use of the bypass switch and doesn’t affect the alarm’s sensitivity or battery life.
| Manufacturer | Safety Technology |
|---|---|
| Decibles | 90 db |
| Battery | Three 1.5V LR44/AG13 Button Cell (Included) |
| Color | White |
| Warranty | 1 year |
| Weight | 0.2 lbs |
| Dimensions | 2 ½” x 1 ¾” x ¾” |
Additional information
Related products
-
Hair Brush Diversion Safe – Realistic Hairbrush Hidden Stash Container, 1¼” x 4″ Interior, Stores Jewelry, Cash & Small Valuables, Bathroom Concealment, 0.6 lbs
$13.95 Add to cart -
Safety Technology Portable Door Guard Alarm 98dB with LED Flashlight – Vibration Detection, Works Through Gloves, Travel-Ready, 20-30 Second Alert, 2 AAA Batteries
$9.00 Add to cart -
Barking Dog Alarm with Radar Sensor – 120dB Siren, 3 Modes, 50-Foot Detection Range, Detects Through Walls & Doors, Remote Control, AC Power with Battery Backup
$79.95 Add to cart -
Safety Technology Door Stop Alarm 120dB – Blocks Door Entry, Movement Tamper Sensor, Low Battery Indicator, 9V Battery, 6.38″ x 1.75″
$7.95 Add to cart
Reviews
There are no reviews yet.